Christian went to air on Monday as a presenter of Melbourne's morning slot on the Southern Cross Austereo station Fox FM.

It is the station and slot Christian worked on before the prank. At the time of the prank, Christian and another Southern Cross Austereo presenter, Mel Greig, were working as summer hosts of a national show, the Hot30 Countdown.

The pair have been off air since the royal prank made international news.

The duo telephoned London's King Edward VII's Hospital in December pretending to be the Queen and Prince Charles, inquiring about the condition of the Duchess of Cambridge, who had been hospitalised in the early stages of her pregnancy.

They duped two members of the hospital staff into divulging private information about the Duchess's condition.

In its aftermath, one of the nurses, Jacintha Saldanha, committed suicide.